${\tan ^{ - 1}}\sqrt {\frac{{1 - {x^2}}}{{1 + {x^2}}}} $ का ${\cos ^{ - 1}}({x^2})$ के सापेक्ष अवकल गुणांक ज्ञात कीजिए।

  • A
    $1/2$
  • B
    $-1/2$
  • C
    $1$
  • D
    $0$

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